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Controllable rigid pile + drainage body + reinforced cushion composite foundation

A technology of reinforced cushion and composite foundation, which is applied in basic structure engineering, construction, soil protection, etc., to shorten the construction period, reduce settlement, and increase bearing capacity.

Active Publication Date: 2019-03-08
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reinforced cushions are only suitable for shallower soft soil foundations

Method used

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  • Controllable rigid pile + drainage body + reinforced cushion composite foundation
  • Controllable rigid pile + drainage body + reinforced cushion composite foundation
  • Controllable rigid pile + drainage body + reinforced cushion composite foundation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The construction steps of the composite foundation of controllable rigid pile + drainage body + reinforced cushion are as follows:

[0044] (1) in figure 1 In the process, the site is first leveled, and the rigid pile 2 is constructed in the soft soil foundation 1;

[0045] (2) Lay a layer of sand cushion 3 not less than 300mm on the surface, and then construct a vertical drainage body 4, the top of the vertical drainage body 4 will enter the sand cushion 3 to ensure that the drainage systems are connected to each other;

[0046] (3) remove the sand cushion 3 above the rigid pile 2 top surface, bury the grouting cylinder 5, the pile head of the rigid pile 2 is encased in the grouting cylinder 5 lower ends, as figure 1 shown;

[0047] (4) Drainpipe 7 is installed then, and drainpipe 7 connects each grouting cylinder 5 in the same cross section, extends horizontally beyond the scope of sand cushion 3, and connects pumping valve 8, as figure 2shown;

[0048] (5) The m...

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Abstract

Disclosed is a combined-type composite foundation with controllable rigidity piles, drainage materials and a reinforced cushion. The reinforced cushion is laid on the surface of a soft soil foundation. The vertical drainage materials and the rigidity piles with caps are arranged in the foundation. Grouting tubes are installed between pile tops and the pile caps to form a controllable supporting system. When grouting is not conducted on the grouting tubes, drainage consolidation is conducted through the soft soil foundation under the effect of an upper load so as to improve the bearing capacity. The bearing effect of the rigidity piles is difficult to play due to the fact that the rigidity piles are stabbed into the grouting tubes. When the grouting tubes are grouted and after slurry is hardened, the pile caps, the slurry and the rigidity piles form a rigidity support, and the goal that the load is undertaken by the piles and soil together to reduce settlement is realized. Meanwhile, the reinforced cushion has the effects of restraining the horizontal displacement of the piles and the soil, limiting the local deformation of a dyke and a dam and the like. According to the composite foundation, the bearing force of the foundation soil can be given full play; the using amount of the rigidity piles is reduced; the stability of the foundation is improved; the post-construction settlement and differential settlement are reduced; the construction period is shortened; and the composite foundation can be applied to projects such as highways, railways and earth-rock dams.

Description

technical field [0001] The invention belongs to the technical field of soft soil foundation treatment, and relates to a novel composite foundation, which can be applied to highways, railways, earth-rock dams and other projects. Background technique [0002] Soft soil has the characteristics of high water content, large void ratio, poor permeability and low shear strength. To build embankments, earth-rock dams and other projects on soft soil foundations, it is necessary to increase the bearing capacity of soft soil foundations, enhance their stability, and reduce post-construction settlements and differential settlements. In addition, the construction period of foundation treatment can be effectively controlled, and the reinforcement cost has certain advantages. Better economics are also key. At present, there are many reinforcement measures for soft soil foundation, such as capped rigid pile composite foundation, drainage consolidation method, reinforced cushion method, etc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/00E02D3/10
Inventor 周志军
Owner WUYI UNIV
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